I've tried and used a lot of note taking apps, including the big ones like evernote and onenote. I have been using cherrytree for a couple of years now and it is terrific:

* good formatted text/content paste from the browser (this is what the other newer contenders mostly fail to do well)

* rich formatted text, images, tables

* ability to organize notes in tree structure

* cross-platform

* open source

* open file format

* no account required

* no electron

* active development (albeit slow)